12/07/2011 01:22 EST | Updated 02/06/2012 05:12 EST

UFC president tweets that Canadian fighter St-Pierre out with knee injury

A different knee. A different injury. And an even worse prognosis.

This time, UFC welterweight champion Georges St-Pierre faces right knee reconstruction surgery and a layoff of probably around 10 months after what he called a freak injury in training.

The 30-year-old mixed martial arts star from Montreal has a torn anterior cruciate ligament and a small tear to his internal meniscus